3 velvet swirl brownies Recipes

unsalted butter, for pan, unsalted butter, sugar, vanilla extract, cocoa powder, salt, vinegar, eggs, all-purpose flour, chopped toasted walnuts, cream cheese, softened, sugar, egg, vanilla extract, special equipment : 8 by 8-inch baking pan

unsalted butter, melted, white sugar, unsweetened cocoa powder, vanilla extract, distilled white vinegar, salt, eggs, slightly beaten, all-purpose flour, cream cheese at room temperature, white sugar, egg, vanilla extract